Mug lid



FIG. 1 is a perspective view of a mug lid showing my new design;

FIG. 2 is a side view showing the opening tab on the left;

FIG. 3 is a side view showing the opening tab on the right;

FIG. 4 is a side view showing the opening tab to the front;

FIG. 5 is a side view showing the opening tab to the rear;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view. 

The ornamental design for a mug lid, as shown and described. 